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在四氫呋喃中球磨改性處理的LaMg11Ni合金吸放氫特性研究
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TG1397

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國家自然科學(xué)基金項目(50071053)和國家高技術(shù)項目(2001AA515021)資助


Hydriding/Dehydriding Behaviour of LaMg11Ni Alloy Modified by Mechanical Grinding in Tetrahydrofuran
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    摘要:

    在四氫呋喃(THF)中對LaMg11Ni合金進行球磨改性處理。研究了改性處理對合金儲氫性能的影響，并研究了THF球磨對LaMg11Ni改性的機理。觀察到在較溫和的溫度(室溫～448K)下合金具有較高的儲氫量和良好的吸氫動力學(xué)性能。在THF中球磨20h的合金試樣在448K和3．2MPa氫壓下，初次的吸氫量達(dá)到3．4％(質(zhì)量分?jǐn)?shù))。放氫性能也得到了改善。XRD分析表明，在THF中球磨改性后的合金有一定程度的非晶化。

    Abstract:

    The structural and hydriding behaviours of the alloy LaMg11Ni after modification by mechanical grinding in tetrahydrofuran (THF) were investigated. The influence of mechanical grinding in THF on surface activation was evaluated by studying the hydrogen absorption/desorption kinetics. The alloy possesses high hydrogen storage and excellent kinetic behaviour, even at moderate temperatures. For the LaMg11Ni alloy milled in THF for 20 h, the hydrogen content of 3.4wt.% was obtained at 448 K and 3.2 MPa H2 after the initial exposure to hydrogen. An even higher hydrogen content of 3.65wt.% was obtained under the same conditions after several hydriding/ dehydriding cycles. Auger electron spectroscopy (AES) was used to determine the surface characteristics of the modified alloy. The modified alloy exhibits a rather high surface activity which improves with increase of milling time. According to XRD analysis the alloy modified by milling THF, show some degree of amorphousness.

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任國新 陳長聘 應(yīng)窕 陳立新.在四氫呋喃中球磨改性處理的LaMg11Ni合金吸放氫特性研究[J].稀有金屬材料與工程,2004,33(9):988~991.[Ren Guoxin, Chen Changpin, Ying Tiao, Chen Lixin. Hydriding/Dehydriding Behaviour of LaMg11Ni Alloy Modified by Mechanical Grinding in Tetrahydrofuran[J]. Rare Metal Materials and Engineering,2004,33(9):988~991.]
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  • 最后修改日期:2003-07-31
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